curl --request POST \
  --url https://api.example.com/proposals/calculate \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "requirements": [
    {}
  ],
  "hourlyRate": 123,
  "settings": {}
}
'

{
  "totalPoints": 123,
  "totalHours": 123,
  "estimatedDays": 123,
  "baseCost": 123,
  "techStackSurcharge": 123,
  "urgencyModifier": 123,
  "clientDiscount": 123,
  "customDiscount": 123,
  "subtotal": 123,
  "tax": 123,
  "total": 123,
  "maintenanceMonthly": 123
}